Virtual mask encoder

Details Virtual mask encoder Virtual mask encoder

1998-06-08

2000-09-26

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 5347, G01D 536

Patent

active

061245895

ABSTRACT:
An encoder for encoding light moving through a grating having alternating opaque and translucent or transparent divisions thereon. Inclusion of a gradient index lens reflector into the encoder eliminates the physical mask required for resolution of finely drawn opaque lines of line pairs.

REFERENCES:
patent: 3496364 (1970-02-01), Foskett
patent: 3524067 (1970-08-01), West
patent: 4180703 (1979-12-01), Cialone
patent: 5017777 (1991-05-01), Ishizuka et al.
patent: 5036192 (1991-07-01), Ishizuka et al.
patent: 5101102 (1992-03-01), Nishimura et al.
patent: 5336884 (1994-08-01), Khoshnerisan et al.
patent: 5451776 (1995-09-01), Kolloff et al.
BEI Motions Systems Company's "Optical Encoder Design Guide", Sep. 1990.

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